Hubbell LX-440 - Manual (Page 8)

Transfer Switch
Page 8 of 16 Pages
Auxiliary Contacts
Auxiliary contacts TSNa3, -a4 and TSEa3, -a4 are available for remote alarms, pilot lights, or other
applications. These contacts are pre-wired for customer connections to PTB1-7 through PTB1-12. The
contacts are rated at 10 A, 125/250 VAC.
Manual Disconnect Switch
The MDS (Manual Disconnect Switch) is mounted on the TRC board. This switch isolates the power
source to the switching mechanism. Then the automatic transfer switch can only be operated manually
with the handle.
C AUTION: Disconnect normal and emergency power sources before using handle to
transfer the contacts.
TEST push button
The TEST push button simulates a loss of power from the normal source and causes the Control Module
to initiate transfer to the emergency source.
Optional Features
The items described in this section are a few of the optional features available with the LX-450
automatic transfer switch. Contact the local Hubbell representative for additional options desired for an
application. Refer to the job schematic and wiring diagrams for these and other features.
BYPASS/RETRANSFER TO NORMAL push button (S1)
This option is standard for combination Fire Pump Controller with automatic transfer switch to meet
NFPA 20 specifications.
Pressing this button allows the transfer switch to retransfer to the normal position bypassing the
RETRANSFER TO NORMAL SOURCE time delay.
Phase Rotation Monitor (H1)
The PRM (Phase Rotation Monitor) contacts open if the phase rotation of the normal power source is
not correct. If the proper phase sequence is not sensed, the LX-301 Control Module does not output a
signal to the TCR board to retransfer the transfer switch to the normal source.
Auxiliary Contacts (A1–A4)
One additional NO/NC set of contacts may be added to the normal and the emergency source side of the
transfer switch. The contacts are rated for pilot duty: 10 A at 125 or 250 VAC.
BYPASS/TRANSFER TO EMERGENCY push button (S2)
This push button overrides the time delay to transfer to the emergency source.